how to get nth term in arithmetic sequence

6:13

1:51

10:14

1:54

6:15

19:02

11:06

4:08

12:28

3:09

12:53

44:04

5:53

6:38

3:21

9:06

8:09

6:37

8:23

5:44

31:20

6:34

2:54

3:40

1:25

19:26

4:32

8:01

5:30

10:23

1:49

9:23

12:57

15:39

2:05

8:49

4:14

17:10

5:54

5:46

9:56

9:07

14:46

2:20

2:21

13:52

12:03

12:46

6:31

4:25

9:06

21:09

11:52

1:40

14:03

8:36

17:49

7:07

7:21

18:49